#14758: Retainer profiler can overflow the C stack
-------------------------------------+-------------------------------------
Reporter: bgamari | Owner: (none)
Type: bug | Status: new
Priority: high | Milestone:
Component: Profiling | Version: 8.4.1-alpha1
Keywords: | Operating System: Unknown/Multiple
Architecture: | Type of failure: None/Unknown
Unknown/Multiple |
Test Case: | Blocked By:
Blocking: | Related Tickets:
Differential Rev(s): | Wiki Page:
-------------------------------------+-------------------------------------
I'm not entirely sure what conditions trigger this, but I am observing a
reliable segmentation fault with a program with large heap compiled with
8.4.1-alpha3 and run with retainer profiling enabled. Judging by the fact
that the crashing instruction is a `mov _, ($rsp)`, I'm reasonable certain
that the issue is a C stack overflow. The top of the stack looks like,
{{{
#0 0x000000000249212c in retainClosure (c0=0x42af3459b8,
cp0=cp0@entry=0x42af347000, r0=r0@entry=0x42bc4fd1a0) at
rts/RetainerProfile.c:1488
#1 0x00000000024932b0 in retain_small_bitmap (c_child_r=0x42bc4fd1a0,
c=0x42af347000, bitmap=<optimized out>, size=<optimized out>,
p=0x42af347260) at rts/RetainerProfile.c:1209
#2 retainStack (c=c@entry=0x42af347000,
c_child_r=c_child_r@entry=0x42bc4fd1a0, stackStart=<optimized out>,
stackEnd=0x42af347370) at rts/RetainerProfile.c:1350
#3 0x0000000002492870 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af345b28, r0=r0@entry=0x2a5ac20 ) at
rts/RetainerProfile.c:1686
#4 0x0000000002492887 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af3473e0, r0=r0@entry=0x42bc4fd1a0) at
rts/RetainerProfile.c:1695
#5 0x00000000024932b0 in retain_small_bitmap (c_child_r=0x42bc4fd1a0,
c=0x42af3473e0, bitmap=<optimized out>, size=<optimized out>,
p=0x42af347690) at rts/RetainerProfile.c:1209
#6 retainStack (c=c@entry=0x42af3473e0,
c_child_r=c_child_r@entry=0x42bc4fd1a0, stackStart=<optimized out>,
stackEnd=0x42af347750) at rts/RetainerProfile.c:1350
#7 0x0000000002492870 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af345d88, r0=r0@entry=0x2a5ac20 ) at
rts/RetainerProfile.c:1686
#8 0x0000000002492887 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af3477c0, r0=r0@entry=0x42bc4fd1a0) at
rts/RetainerProfile.c:1695
#9 0x00000000024932b0 in retain_small_bitmap (c_child_r=0x42bc4fd1a0,
c=0x42af3477c0, bitmap=<optimized out>, size=<optimized out>,
p=0x42af347a70) at rts/RetainerProfile.c:1209
#10 retainStack (c=c@entry=0x42af3477c0,
c_child_r=c_child_r@entry=0x42bc4fd1a0, stackStart=<optimized out>,
stackEnd=0x42af347b30) at rts/RetainerProfile.c:1350
#11 0x0000000002492870 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af3481a8, r0=r0@entry=0x2a5ac20 ) at
rts/RetainerProfile.c:1686
#12 0x0000000002492887 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af347ba0, r0=r0@entry=0x42bc4fd1a0) at
rts/RetainerProfile.c:1695
#13 0x00000000024932b0 in retain_small_bitmap (c_child_r=0x42bc4fd1a0,
c=0x42af347ba0, bitmap=<optimized out>, size=<optimized out>,
p=0x42af347e50) at rts/RetainerProfile.c:1209
#14 retainStack (c=c@entry=0x42af347ba0,
c_child_r=c_child_r@entry=0x42bc4fd1a0, stackStart=<optimized out>,
stackEnd=0x42af347f10) at rts/RetainerProfile.c:1350
#15 0x0000000002492870 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af348408, r0=r0@entry=0x2a5ac20 ) at
rts/RetainerProfile.c:1686
#16 0x0000000002492887 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af349000, r0=r0@entry=0x42bc4fd1a0) at
rts/RetainerProfile.c:1695
#17 0x00000000024932b0 in retain_small_bitmap (c_child_r=0x42bc4fd1a0,
c=0x42af349000, bitmap=<optimized out>, size=<optimized out>,
p=0x42af3492b0) at rts/RetainerProfile.c:1209
#18 retainStack (c=c@entry=0x42af349000,
c_child_r=c_child_r@entry=0x42bc4fd1a0, stackStart=<optimized out>,
stackEnd=0x42af349370) at rts/RetainerProfile.c:1350
#19 0x0000000002492870 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af348668, r0=r0@entry=0x2a5ac20 ) at
rts/RetainerProfile.c:1686
#20 0x0000000002492887 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af3493e0, r0=r0@entry=0x42bc4fd1a0) at
rts/RetainerProfile.c:1695
#21 0x00000000024932b0 in retain_small_bitmap (c_child_r=0x42bc4fd1a0,
c=0x42af3493e0, bitmap=<optimized out>, size=<optimized out>,
p=0x42af349690) at rts/RetainerProfile.c:1209
#22 retainStack (c=c@entry=0x42af3493e0,
c_child_r=c_child_r@entry=0x42bc4fd1a0, stackStart=<optimized out>,
stackEnd=0x42af349750) at rts/RetainerProfile.c:1350
#23 0x0000000002492870 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af3488c8, r0=r0@entry=0x2a5ac20 ) at
rts/RetainerProfile.c:1686
#24 0x0000000002492887 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af3497c0, r0=r0@entry=0x42bc4fd1a0) at
rts/RetainerProfile.c:1695
#25 0x00000000024932b0 in retain_small_bitmap (c_child_r=0x42bc4fd1a0,
c=0x42af3497c0, bitmap=<optimized out>, size=<optimized out>,
p=0x42af349a70) at rts/RetainerProfile.c:1209
#26 retainStack (c=c@entry=0x42af3497c0,
c_child_r=c_child_r@entry=0x42bc4fd1a0, stackStart=<optimized out>,
stackEnd=0x42af349b30) at rts/RetainerProfile.c:1350
#27 0x0000000002492870 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af348b28, r0=r0@entry=0x2a5ac20 ) at
rts/RetainerProfile.c:1686
#28 0x0000000002492887 in retainClosure (c0=<optimized out>,
cp0=cp0@entry=0x42af349ba0, r0=r0@entry=0x42bc4fd1a0) at
rts/RetainerProfile.c:1695
...
}}}
and this goes on for at least 30000 frames. It looks very much like this
is a bug in the retainer profiler.
--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14758
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler
